The present invention relates to a ceiling-mounted x-ray imaging apparatus. Disclosed is the ceiling-mounted x-ray imaging apparatus comprising: a body (100) which moves horizontally along a rail frame (110) installed under a ceiling； a post unit (200) which is mounted under the body (100), and can extend upward and downward； an x-ray photographing module (300) which is rotatably installed under the post unit (200)； a shaft module (400) which includes a drum shaft (410) adapted to be rotatably and horizontally installed inside the body (100), a pose drum (420) adapted to be mounted on the drum shaft (410) and to wind a post wire (421) connected to the post unit (200), a first balance drum (430) adapted to be mounted on the drum shaft (410) and to wind one end of a first balance wire (431), and a second balance drum (440) adapted to be mounted on the drum shaft (410) and to wind one end of a second balance wire (441)； a first spring balance (500) which is disposed inside the body (100) to face the first balance drum (430), and winds the other end of the first balance wire (431) by using tensile force attributable to a spring member (510) disposed inside the first spring balance (500)； and a second spring balance (600) which is disposed inside the body (100) to face the second balance drum (440) and to be disposed on a side of the first spring balance (500), and winds the other end of the second balance wire (441) by using tensile force attributable to a spring member (610) disposed inside the second spring balance (600).본 발명에 따르면, 천장에 설치된 레일프레임(110)을 따라 수평이동하는 본체부(100)； 상기 본체부(100)의 하부에 장착되어 상하로 신축하는 포스트부(200)； 상기 포스트부(200)의 하부에 회전가능하게 설치되는 엑스선 촬영모듈(300)； 상기 본체부(100) 내부에 회전가능하게 수평설치되는 드럼샤프트(410)와, 상기 드럼샤프트(410)에 장착되어 상기 포스트부(200)에 연결된 포스트와이어(421)를 권취하는 포스트드럼(420)과, 상기 드럼샤프트(410)에 장착되어 제1밸런스와이어(431)의 일측을 권취하는 제1밸런스드럼(430) 및, 상기 드럼샤프트(410)에 장착되어 제2밸런스와이어(441)의 일측을 권취하는 제2밸런스드럼(440)을 포함하는 샤프트모듈(400)； 상기 본체부(100) 내에서 상기 제1밸런스드럼(430)과 대향배치되며 내부에 장착된 스프링부재(510)의 인장력으로 상기 제
